function depliMenu(uidMenu) {
	
	if (document.getElementById('menu')) var MENU = document.getElementById('menu');
	if (document.getElementById('menuHome')) var MENU = document.getElementById('menuHome');
	
	// on cache tous les niveau2
	eltUL = MENU.getElementsByTagName('ul');
	for (i = 0; i < eltUL.length; i++) {
		if (eltUL[i].id.substring(0,5) == 'niv2_') eltUL[i].style.display = 'none';;
	}
	
	// on deroule...
	if ( document.getElementById('niv2_'+uidMenu) ) 
		document.getElementById('niv2_'+uidMenu).style.display = 'block';
	
	// on recale les elements
	js_positionnement();

}